>> OOC, exactly how much space do you recon it would take to build 64KB out 
>> of discrete NAND gates?
> 
> For memory you could use a D type flip-flop which can be made using 4 NAND gates
> and an inverting gate. It would be better to use a Master-slave D type flip-flop
> which would double the components. So for each *bit* of memory you would need 2
> X 7400s and 1/3 X 7404. or a 7474 or a 7479.
> 
> What size of word are you thinking of? IIRC the typical power consumption of TTL
> is about 250 ma. You will need a robust power supply.

Of course, I have no serious *intention* of making more than about a 
dozen bytes of RAM using only NAND gates. ;-) But I'm aware that way 
back in prehistoric times, they used to do it this way.

No wonder computers cost more that housing estates - they were *bigger* 
than housing estates! :-D

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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